Daily Sunspot Evaluation
Observation Sheet Friday, 21 April 1961
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 5
- Number of spots (f)
- 8
- Relative number (R)
- 58
- Observer
- MH
- Reading
- all checks consistent
- File
- 19610421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 8 | 12E | ||||
| 2 | J – 1 | -9 | 23E | ||||
| 3 | J – 1 | 2 | 54W | ||||
| 4 | A – 4 | 9 | 47W | ||||
| 5 | A – 1 | 14 | 63W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.